og url - is there a token to strip the ssl designation or some other workaround?

You can just use the theme_metatag_opengraph() function in your template.php file to process the tag before it is output:

/**
 * Theme callback for an OpenGraph meta tag.
 */
function THEMENAME_metatag_opengraph($variables) {
  $element = &$variables['element'];
  switch ($element['#name']) {
    case 'og:image':
      $element['#value'] = str_replace('https://', 'http://', $element['#value']); 
      break;
  }

  element_set_attributes($element, array('#name' => 'property', '#value' => 'content'));
  unset($element['#value']);
  return theme('html_tag', $variables);
}

@madhatter23: thanks for providing a solution.

This is such an edge case I don't think it needs further documenting.

What about supporting og:image:secure_url?

https://developers.facebook.com/bugs/405588419493203

@aidanlis: That's the opposite of what he's trying to do, but good tip anyway.

This was my quick hack to strip out the https and preprocess the image:

function THEMENAME_html_head_alter(&$head_elements){
  if (isset($head_elements['metatag_og:image']['#value'])) {
    $img = &$head_elements['metatag_og:image']['#value'];
    $img = str_replace('https://www.', 'http://static.', $img);
    $img = str_replace('/sites/default/files', '/sites/default/files/styles/ogthumb/public', $img);
  }   
}

You could also use hook_tokens_alter.

Hijacking this issue, sort of, as this is the issue that shows up in google searches.

We need to support og:image:secure_url, via http://ogp.me/#structured

Please open a new issue for this new tag.